Immersion Meneame.net, Taringa.net
Both are similar to Digg or Reddit, but in Spanish.
Issuu.com
Online reader – Search “Spanish” to find many Spanish magazines to read
Mitele.es
Spanish TV online
Reddit.com/… (r/Spanish, r/LearnSpanish, r/LanguageLearning)
Subreddits that helped me create this guide by reviewing and error-checking, as well as submitting ideas for more content. Native and non-native speakers to answer questions and help!